Mr Williams said while some of opera's best-known singers had sung with the Maelgwn choir, it was a coup to get a household name like Hayley. "Hayley is what you'd call a popular classical singer," he said. "Our annual concerts have been going for nearly 30 years and we've had some quite big operatic names, but perhaps lesser-known names for most people. "But to have Hayley share a stage with us is something we're very excited about. "It was a surprise at first. But her agent knows about the male voice choir tradition in Wales and I think they're glad to be a part of it." Hayley became an instant classical world star when she was invited by Pantglas bass-baritone, Bryn Terfel, to perform at the 2003 Faenol Festival. Her debut album Pure achieved double-platinum sales in the UK, and proved a hit all over the world. | 
